Development of depletion models for radionuclide inventory, decay heat and source term estimation in discharged fuel

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1 Development of depletion models for radionuclide inventory, decay heat and source term estimation in discharged fuel S. Caruso, A. Shama, M. M. Gutierrez National Cooperative for the Disposal of Radioactive Waste (NAGRA) Hardstrasse 73, 5430 Wettingen, Switzerland

2 Outline I. Spent fuel in Switzerland II. Fuel depletion and cladding activation models III. Model validation IV. Applications V. Conclusion and further steps 2 S. Caruso

3 I. Swiss nuclear power plants 6 5 NPPs installed output: 3,200 MW Percentage of total power production: ca. 40 % 3 S. Caruso

4 I. Spent Fuel and Radioactive Wastes SNF: ca spent fuel assemblies are expected to be discharged from the operation of the Swiss reactors (more than FAs are currently in interim dry storage sites: ZWILAG, ZWIBEZ). Others in wet storage pools. For each of the Swiss reactors, different designs of fuel assemblies have been used and, among these, the fuel enrichment and burnup also vary. Furthermore, many of these spent fuel assemblies exhibit very high burnup NPP NPP type Fuel type FAs EOL Beznau I PWR UO 2 > 1500 Beznau II PWR MOX ca. 230 Gösgen PWR UO 2 > 1500 Gösgen PWR MOX ca. 150 Leibstadt BWR UO 2 > 7000 Mühleberg BWR UO 2 > 1000 Tot UO 2 UO 2 > Tot MOX MOX ca. 380 Tot PWR - 30% Tot BWR - 70% Total ca SNFs (and also HLW) are foreseen for deep geological disposal 4 S. Caruso

5 II. Depletion Calculations Scope of the study: use of a state-of-the-art reactor physics code to model different types of fuel bundle, representative of the fuels employed in the Swiss power plants. I. Calculation and validation of the nuclide inventory against chemical measurements (samples from international projects: Malibu, Ariane, etc.) II. III. Development of binary libraries ready to be implemented in reactor physics code (e.g. Origen-ARP, Origami) Estimation of the full radionuclide inventory based on the new models.

6 II. Method for fuel depletion and cladding activation I. Development of a Fuel Assembly model with SCALE/Triton. Fuel depletion (POWER mode) and cladding activation (FLUX mode) II. III. Validation of calculated nuclides concentrations against available experimental data (work used also for T/S cask license application) Fuel libraries for ORIGEN-ARP and structure materials libraries for ORIGEN-S are generated (covering different fuel enrichment and burnup ranges) In general ORIGEN-ARP is employed in Nagra-projects for : Determination of the radionuclides inventory of spent fuel for the MIRAM inventory (long term safety analysis) Determination of neutron and gamma source terms Decay power (canister loading optimization and long term SA) About the TRITON model and related Assumptions: TRITON is a sequence of SCALE (SCALE 6.1.3) Cross-section processing with CENTRM/PCM (ENDF/B-VII) Approximations: 1/8 symmetry of the FA, ¼ FA model using mirror boundary conditions Optimized material numbers implemented - assign function No library collapse (no weight function) 6 S. Caruso

7 II. Method for fuel depletion and cladding activation I. Development of a Fuel Assembly model with SCALE/Triton. Fuel depletion (POWER mode) and cladding activation (FLUX mode) II. III. Validation of calculated nuclides concentrations against available experimental data (work used also for T/S cask license application) Fuel libraries for ORIGEN-ARP and structure materials libraries for ORIGEN-S are generated (covering different fuel enrichment and burnup ranges) ORIGEN-ARP standard (SVEA 100) ORIGEN-ARP developed (SVEA 96) Reference: M. Gutierrez Development and validation of 2D and 3D SCALE LWR fuel assembly models for burnup calculations and activation studies, M.Sc. Thesis in Nuclear Engineering ETHZ (2015) 7 S. Caruso

8 III. Model validation: SVEA-96 BWR (70GWd/t) 4.5 wt.% enr. General good C/E agreement Better agreement ARP-96 compared to ARP-100: 235 U (3.7% vs -28.8%) Worse agreement observed for the Pu vector (but within 20%) Fission products very well predicted 8

9 III. Model validation: 14x14 MOX PWR (52GWd/t) ARIANE BM5 TRITON in pin power mode: RHS rods are assigned/treated with individual material numbers. TRITON in pin power mode: fuel pin in ring-wise representation. Only rods neighbour to sample are assigned/treated with individual material numbers. TRITON in assembly power mode: only rods neighbour to sample are assigned/treated with individual material numbers. 9 S. Caruso

10 III. Model validation: 14x14 MOX PWR (52GWd/t) ARIANE BM5 60% 40% TRITON (Pin Power) TRITON (Pin Power, BM5 rod as 10 rings) TRITON (Assembly Power) -ve Experimental Deviation +ve Experimental Deviation 60% 40% 20% 20% 0% 0% -20% -20% -40% -40% -60% Measurements from ICP/MS PSI -60% 10 S. Caruso

11 III. Model validation: 15x15 UO2 PWR (53GWd/t) ARIANE GU3 80% 60% TRITON (Pin Power) POLARIS (Pin Power) +ve Experimental Deviation -ve Experimental Deviation 80% 60% 40% 40% 20% 20% 0% 0% -20% -20% -40% -40% -60% Measurements from ICP/MS ITU -60% -80% -80% 11 S. Caruso

12 IV. Application: Radionuclide inventory for spent fuel Goal: Determination of radionuclide inventory for long term safety assessment in geological repository. 1. Definition/development of representative FAs categories, according to power plant, fuel type and fuel characteristic (BU, enrichment). 2. Development of corresponding code specific libraries (fuel type and NPP). 3. Calculation of radionuclides inventory for all spent fuel. 4. The corresponding calculated radionuclides inventory is imported in a database (MIRAM), according to each defined categories. MIRAM is the Nagra Model Inventory for Radioactive waste Management. 12 S. Caruso

13 IV. Application: Radionuclide inventory Total waste activity build-up, according to the main MIRAM categories. 13 S. Caruso

14 IV. Activation products calculations Example from the CAST project: Estimation of C-14 and activation products in LWR spent fuel assembly cladding and structural materials. Task: Determining inventory of 14 C in Zircaloy-4 and stainless steel of an UO 2 PWR spent fuel rod segment with a fuel depletion/activation model (Nagra) and comparison against available experimental data from KIT. Samples: Zircaloy-4 cladding and stainless steel plenum spring sampled from a fuel rod segment irradiated in the Swiss Gösgen PWR Average burn-up: 50.4 GWd/t HM Irradiation duration: 1226 days 3860 mm Method: Material irradiated using ORIGEN-S Employing the cladding libraries produced with TRITON 14 S. Caruso

15 IV. Application: Decay heat in disposal canister Goal: Determination of decay heat as function of time for long term safety assessment in geological repository. 15 S. Caruso

16 IV. Application: Gamma, neutron source terms Determination of neutron and gamma source terms to be input for shielding design and operational safety assessment. The model validation has found relevant applications in the framework of the collaboration between nuclear utilities and Nagra, in relation to the source term evaluation and related aspects: o An Extension of the Validation of isotopic predictions for MOX Spent Fuel, using MALIBU and PROTEUS program in the framework of transport/storage cask licensing o Qualification of ORIGEN-ARP isotopic predictions for BWR Spent Fuel Assemblies in the framework of transport/storage cask licensing. This recent work is already approved by the regulator. M. Gutierrez Development and validation of 2D and 3D SCALE LWR fuel assembly models for burnup calculations and activation studies, M.Sc. Thesis in Nuclear Engineering ETHZ (2015) 16 S. Caruso

17 IV. Application: Burup Credit for criticality safety Goal: Assessment of the Criticality Safety for 1 Million year, though the employment of Burnup Credit Cooperation Nagra / PSI: BUCSS-R Project The evolution of K-eff for different discharge burnup values was studied for both actinides only and actinides + fission products cases. Example of flooded canister, loaded with four UO2 (MCNPX) Reference: J. J. Herrero, M. Pecchia, H. Ferroukhi, S. Canepa, A. Vasiliev, S. Caruso, Computational scheme for burnup credit applied to long term waste disposal, International Conference on Nuclear Criticality Safety, Charlotte, NC, September 13-17, S. Caruso

18 IV. Application: Burup Credit for criticality safety Goal: Assessment of the Criticality Safety for 1 Million year, though the employment of Burnup Credit Cooperation Nagra / PSI: BUCSS-R Project The evolution of K-eff for different discharge burnup values was studied for both actinides only and actinides + fission products cases. Example of flooded canister, loaded with four UO2 (KENO-VI) 18 S. Caruso

19 IV. Criticality Safety Assessment: BU-Credit Evolution of k-eff for the intact canister loaded with UO2 fuel, at 5 wt% 235 U S. Caruso 19

20 IV. Criticality Safety Assessment: BU-Credit Evolution of k-eff for the intact canister loaded with MOX fuel S. Caruso 20

21 Conclusions & Further steps The methodology proves to be fast and reliable, being based on 2-steps: Build-up of SCALE/Triton libraries with large computational time, but needed only in the first phase Origen-Arp and Origen-S standalone depletion and activation calculations with short computational time and large flexibility Further work is still needed: Further development and validation of other fuel assembly models 3D depletion/activation models to address properly the axial heterogeneities Test of new reactor physics codes 21 S. Caruso

22 thank you for your attention

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